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f5974c8f8c
Add omitted comments for different structures in driver implementation. Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
118 lines
4.0 KiB
C
118 lines
4.0 KiB
C
/*
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* mdt.h - NILFS meta data file prototype and definitions
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*
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Ryusuke Konishi <ryusuke@osrg.net>
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*/
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#ifndef _NILFS_MDT_H
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#define _NILFS_MDT_H
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#include <linux/buffer_head.h>
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#include <linux/blockgroup_lock.h>
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#include "nilfs.h"
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#include "page.h"
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/**
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* struct nilfs_shadow_map - shadow mapping of meta data file
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* @bmap_store: shadow copy of bmap state
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* @frozen_data: shadowed dirty data pages
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* @frozen_btnodes: shadowed dirty b-tree nodes' pages
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* @frozen_buffers: list of frozen buffers
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*/
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struct nilfs_shadow_map {
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struct nilfs_bmap_store bmap_store;
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struct address_space frozen_data;
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struct address_space frozen_btnodes;
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struct list_head frozen_buffers;
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};
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/**
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* struct nilfs_mdt_info - on-memory private data of meta data files
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* @mi_sem: reader/writer semaphore for meta data operations
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* @mi_bgl: per-blockgroup locking
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* @mi_entry_size: size of an entry
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* @mi_first_entry_offset: offset to the first entry
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* @mi_entries_per_block: number of entries in a block
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* @mi_palloc_cache: persistent object allocator cache
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* @mi_shadow: shadow of bmap and page caches
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* @mi_blocks_per_group: number of blocks in a group
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* @mi_blocks_per_desc_block: number of blocks per descriptor block
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*/
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struct nilfs_mdt_info {
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struct rw_semaphore mi_sem;
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struct blockgroup_lock *mi_bgl;
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unsigned mi_entry_size;
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unsigned mi_first_entry_offset;
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unsigned long mi_entries_per_block;
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struct nilfs_palloc_cache *mi_palloc_cache;
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struct nilfs_shadow_map *mi_shadow;
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unsigned long mi_blocks_per_group;
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unsigned long mi_blocks_per_desc_block;
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};
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static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode)
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{
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return inode->i_private;
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}
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/* Default GFP flags using highmem */
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#define NILFS_MDT_GFP (__GFP_WAIT | __GFP_IO | __GFP_HIGHMEM)
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int nilfs_mdt_get_block(struct inode *, unsigned long, int,
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void (*init_block)(struct inode *,
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struct buffer_head *, void *),
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struct buffer_head **);
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int nilfs_mdt_delete_block(struct inode *, unsigned long);
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int nilfs_mdt_forget_block(struct inode *, unsigned long);
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int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long);
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int nilfs_mdt_fetch_dirty(struct inode *);
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int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz);
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void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned);
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int nilfs_mdt_setup_shadow_map(struct inode *inode,
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struct nilfs_shadow_map *shadow);
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int nilfs_mdt_save_to_shadow_map(struct inode *inode);
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void nilfs_mdt_restore_from_shadow_map(struct inode *inode);
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void nilfs_mdt_clear_shadow_map(struct inode *inode);
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int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh);
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struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode,
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struct buffer_head *bh);
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static inline void nilfs_mdt_mark_dirty(struct inode *inode)
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{
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if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state))
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set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
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}
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static inline void nilfs_mdt_clear_dirty(struct inode *inode)
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{
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clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
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}
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static inline __u64 nilfs_mdt_cno(struct inode *inode)
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{
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return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno;
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}
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#define nilfs_mdt_bgl_lock(inode, bg) \
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(&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock)
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#endif /* _NILFS_MDT_H */
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